Olay — Oil of olay regenerist with spf 15

I was using oil of olay regenerist the normal one with a round container for years, but due to un availability in the store. i changed it to the other OIL OF OLAY REGENERIST WITH SPF 15. But on the first day that i used it, i felt itchiness on my neck.. it was itchy for almost 3 days. I felt this also when i used OIL OF OLAY WHIP. why is it so? is there a strong component on the product. that's why when i saw there is a big discount on Oil of olay Whip yesterday i didn't buy it. i will try later the other Olay with 7 in one and will see if there is no bad effect on my skin.
how can i return the product to the store? it is already open.
thank you,
amelia